<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>碰撞试验</title>
  <link rel="stylesheet" href="./index.css">
</head>
<body>
  <div class="container">
    <div class="item item-1"></div>
  </div>
  <div class="btn">
    <div class='btn-stop' onclick='stop()'>stop</div>
    <div class='btn-pause' onclick='pause()'>pause</div>
    <div class='btn-start' onclick='run()'>start</div>
  </div>

  <script src="./index.js"></script>
</body>
</html>